Abstract: Disclosed are products, systems, and methods for delivering a material to an internal body part such as bone. In one variation, the product comprises a segmented plunger having a plurality of segments, where the plurality of cylindrical segments are sized for urging a material through an access member to thereby deliver the material to predetermined location in a subject's body. The segmented plunger may be used with a catheter for delivering a bone filler or a bone cement to a bone requiring repair.